Show ENEMIES OF TREES IN LARGE NUMBERS weather conditions have been favorable for reproduction of plant lice or aphids thir season renson plant roc 1100 or aphids on treen and aid shrubs are more acre abundant than in many anany years weather conditions hera been very favorable for their suction and very vary unfavorable tor for the production ne Iv of thele their parasitic ene enemies many of the aphids la in normal years attracted very little atter tion in abs abnormal ormal years methods of cent control rol must be used i 9 keep them within bounds |